Boring or penetrating the earth – Boring with explosion in inaccessible hole – With bore condition firing control – or compensating means
Patent
1992-07-06
1994-01-11
Novosad, Stephen J.
Boring or penetrating the earth
Boring with explosion in inaccessible hole
With bore condition firing control, or compensating means
166316, 166375, E21B 43112, E21B 3410, E21B 431185
Patent
active
052772624
ABSTRACT:
A hydraulic safety pin is interconnected between a device, such as a pressure controlled firing head associated with a perforating gun, and a small diameter tubing in a wellbore. When, the small diameter tubing is filled with fluid under pressure, the hydraulic safety pin allows the fluid to fill the small diameter tubing but prevents the pressure of the fluid in the small diameter tubing from accidentally detonating the firing head when the pin is disposed in a first position; however, when the tubing is already filled with fluid under pressure, the hydraulic safety pin allows the pressure of the fluid in the small diameter tubing to detonate the firing head when the pin is disposed in a second position. The hydraulic safety pin may be installed in a special coupling, and multiple special couplings may be used in a tool string disposed in a wellbore.
REFERENCES:
patent: 4431051 (1984-02-01), Adams, Jr.
patent: 4531590 (1985-07-01), Peterson
patent: 4624315 (1986-11-01), Dickson et al.
patent: 4924952 (1990-05-01), Schneider
patent: 5165480 (1992-11-01), Wagoner et al.
patent: 5165489 (1992-11-01), Langston
patent: 5180015 (1993-01-01), Ringgenberg
Edwards A. Glen
Huber Klaus B.
Smith, Jr. Edward G.
Bouchard John H.
Garrana Henry N.
Novosad Stephen J.
Schlumberger Technology Corporation
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